There might be. Fanfiction allows for all kinds of wild ideas. In a story where Erza is Naruto's sister, it could start with some kind of backstory explaining how they got separated across different dimensions or something. Then as the story progresses, they could discover their relation and work together to face challenges. It could also explore the reactions of their respective friends and allies to this newfound family bond. For instance, how would Sasuke react to Naruto having a sister from another world? And how would the Fairy Tail guild members feel about Erza having a brother in a completely different universe?
A common theme is sisterly love and loyalty. The stories often revolve around the idea that no matter what, the little sister and Erza will be there for each other. For example, in many fictions, when one is in danger, the other will risk everything to save her.
It could be a story full of action and adventure. The Seventh Sister, with her lightsaber skills, and Erza, with her magic and sword - fighting abilities, could join forces to fight a powerful enemy. This enemy could be a dark wizard in Erza's world or a new Sith - like threat in a combined universe. Their combined powers would make for some epic battles and a really exciting fanfiction.
There's also a fanfiction where Erza's little sister has a special power that she discovers. In this story, the little sister has to learn to control it while also dealing with the expectations that come with being related to Erza. It's an interesting take on how family relationships can be complex in the context of a fictional universe.
The plot could start with Erza being mysteriously transported to the Naruto universe or vice versa. They would initially be unaware of their relation. As they interact, they might notice some similarities in their personalities or abilities. Eventually, they discover they are siblings. Then they would team up to fight against powerful villains threatening both their worlds. Maybe there's a dark force that wants to use their combined power for evil, and they have to resist it together.
One possible plot is that the Seventh Sister gets lost in a different dimension and ends up in Erza's world. She is confused and starts causing trouble, but Erza tries to reason with her. Eventually, they find a way to send the Seventh Sister back home, but not before they form a bond of mutual respect.
Sure. A lot of fanfic writers prefer to stay away from adult - themed content. They might write about how Erza Scarlet and Erza Knightwalker could team up against common enemies. Maybe they'd write about how they learn from each other's fighting styles or how they come to understand each other's pasts better. So, it's very possible to find non - 'lemon' fanfics about them.
In Natsu x Erza fanfic, their relationship can be full of adventure - based camaraderie. Natsu is often depicted as the impulsive and powerful mage, while Erza is the strong - willed and disciplined one. They might team up frequently, with Natsu's spontaneity contrasting Erza's calculated moves. This can lead to interesting character dynamics, where they both learn from each other and grow together in their fictional adventures.
In many fanfictions, Natsu and Erza often have a complex relationship. Natsu is usually depicted as a bold and passionate character, while Erza is strong - willed. Their relationship might start from comradeship within the guild. Some fanfictions may explore how they gradually develop deeper feelings for each other, like through shared adventures and facing challenges together. This can lead to a mutual understanding and respect that could potentially turn into a romantic relationship.
One possible reason could be a misunderstanding. Erza might misunderstand Naruto's intentions. For instance, if Naruto is on a mission that involves some secretive actions, Erza could misinterpret them as something malicious and decide to betray him.